Abstract: Composite foundation with cement-fly ash-gravel piles had been widely applied to the average unit weight and soil of consolidation which had completed the grain filling soil foundation. Based on practical engineering, first of all, Use of cement fly ash gravel pile low-strain integrity test gauge in the nation, evaluate its effective length of pile within the scope of the pile integrity; in addition, through the static load test to verify the cement fly ash gravel pile composite foundation bearing capacity and bearing capacity of single pile composite foundation to enhance body whether meet the design requirements; at the same time, combined with the construction pile driving records, the geotechnical engineering investigation report, the design drawings of pile foundation and other information, come to the Objective comprehensive evaluation of the bearing capacity values and integrity of pile body, provide the basis for construction engineering design and construction.